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\begin{document}

\title{LES investigation of flame acceleration and DDT of methane-air mixture
in rectangular channel}



\author[1]{yongyao zhao}%
\author[2]{yanmin zhang}%
\affil[1]{Jinzhong University}%
\affil[2]{Shanxi Vocational University of Engineering Science and Technology}%


\vspace{-1em}



  
  \date{May 17, 2024}


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\begin{abstract}
Large eddy simulation (LES) is used to simulate flame acceleration (FA)
and deflagration to detonation transition (DDT) of methane--air mixtures
in a small-scale 3D channel. The simulation results show that, in the
early stages, the flame velocity increases exponentially because of the
expansion of combustion products and the wrinkle of flame surface. In
the next stage, the interaction between flame and pressure wave makes
flame accelerate continuously, and the acceleration rate of the flame
velocity decreases first and then increases. As the pressure of the
leading shock increases, the boundary layer is heated by the preheating
area in front of the flame surface which causes the ultrafast flame
propagates in the boundary layer. The ultrafast flame generates oblique
shock waves continuously moving to the center of the channel and
colliding with each other, which promote the occurrence of local
explosion and the coupling of flame surface and leading shock wave.%
\end{abstract}%



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\textbf{Hosted file}

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